It also runs on non "Microsoft systems."

I've been writing C# for over a decade, and 99% of it has deployed in Docker containers to Linux VM's (via k8s etc).

This post seems nonsensical.

C# is definitely popular for game development, but saying no other language comes close does not seem to be true. Looking at the most popular game engines and frameworks, it seems to be about as represented as anything else.

Game engines: Unreal - C++, Unity - C#, Godot - GDScript (Python) + second-class C# support

Frameworks: Raylib - C, Bevy - Rust, Love2D - Lua, Monogame - C#, Phaser - JS, PyGame - Python

We don't know for sure what AAA companies rolling their own engines use, but the industry standard would be written in C++, exposing C++ for programmers and Lua for non-programmers/modders.

More games are written in javascript than any other language, sad but true.